1、JDK配置____________________________________________________________
	vi /etc/profile
		export JAVA_HOME=/opt/java/jdk1.7.0_11
		export JAVA_JRE=/opt/java/jdk1.7.0_11/jre
		export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_JRE/lib:$CLASSPATH
		export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH
	source /etc/profile	
		
	~/.bashrc是当前用户的工作目录
		当前用户是root，则为/root/.bashrc
		当前用户是river，则为/home/river/.bashrc
	
	/etc/profile 是所有用户的环境变量
	/etc/enviroment是系统的环境变量
	登陆系统时shell读取的顺序应该是 
	/etc/profile ->/etc/environment -->$HOME/.profile   -->$HOME/.env	
	
	/etc/environment中的PATH不能引用$JAVA_HOME,因为变量还没有初始化
	
	
2、elclipse配置____________________________________________________________

3、svn配置____________________________________________________________

4、maven配置____________________________________________________________